An amusing story set in a medieval abbey. Wilfred, one of the two resident choirboys at the abbey, is blamed when the abbey cellar is flooeded three nights in a row, but eventually it is discovered to be another culprit, a mysterious little creature who, the monks decide, is a devil. Having caught their little devil, they decide to keep him, and see if they can reform him. Named Thingummy, he is dressed in a novice's robe and encouraged to adapt to abbey life. Complicatione naturally arise from having a supposed devil resident in the abbey, especially as Gosvin, the other choirboy, is enjoying picking on the hapleess little devil. Wilfrid is not convinced that the odd little creature is a devil at all, and strange things continue to happen, creating confusion all round.
This is an entertaining and humorous story which should appeal to those who like light hearted fantasy with likeable characters.